Variable-throttle valve.



J. F. OVENDEN.

VARIABLE THROTTLE VALVE APPLICATION FILED NOV. 11, 1913.

Patented June 9,1914.

w is i n Kym" 9 0 wfd h a I 1N lTlliD STATEE P Thu i w JOSEPH runnersovnnnniu, or ocean caornon, snsnann. 51o INGIERSOLL- RAND COMPANY, OFLU'NDUN, El l'GLr-al VARIABLE-THROTTLE VALVE.

Specification of Letters Patent.

Application filed November 1L 1913.

1/ 0 all whom it may concern Be it known that l, Josnrrr FRANCIS()vnNnnN, a Slibjetlt of the King of Great Britain, and resident ofSouth Croydon, in the county of Surrey, ll lngfiand have invent ed a newor linproved VariableThrottle Valve, of which the following is aspecification.

This invention relates to a new or improved variable throttle valvewhich is es pecially applicable for controlling the sup ply of fluidsuch as for example air or steam under pressure to percussive tools suchas rock drills, percussive hammers such for example as are employed torchipping; and riveting, and other similar operating tools the said valvebeing; also preferably so con structed as to facilitate the introductionof lubricant not only to the said valve but also to other parts of theapparatus.

The invention concerns throttle valves in which a cylindrical pistondevice is movable in relation to ports formed in the wall of thecylindrical valve casing; and a initered or other shaped end on thepiston is seated upon an annular seating at one end of the casing whenthe piston device covers the ports and is lifted from such seating whenthe piston device is moved in the direction for uncovering the portsaforesaid.

The alve is adapted for variable throttling by forming the port or portsin such a manner that during the opening movement of the piston valvethe portor ports is or are gradually uncovered. This is ac complishedfor example by forming; a num ber of ports around the casing atdifferent or graduated distances from the valve seat. Preferably eachend of the piston device is formed with a miter or with a taper orrounded or hollow surface suitable tor acting as a valve and if desiredcylindrical ere tensions of relatively small diameter and length may beformed on each end. The valve seating may consist of an externallyscrew-threaded ring screwing into the easing. The end of the casingremote from. the main valve seat conveniently closed by a removable plugwhich also serves as an abutment for the spring which tends to keep thevalve on its end seating. This plug may be solid, or it may be hollowand perforated tor the introduction of lubricant, being then normallyclosed by a ball or l other valve. The ports for the admission ofpressure fluid to the casing which are made at dii'lerent distances fromthe valve seat as aforesaid may be drilled at an angle to the axis ofthe casing so as to point more or less in the direction of the valveseat. The valve itself is preferably perforated for instance with anaxial hole through which oil passes from the valve casino; iiito thetool to lubricate all parts thereof:

I Figure l of the accoi'npanying; drawings is a vertical section ofthrottle valve constructcd accordion; to this hivention. Fin. 2 is aplan of the same. Pie. 8 is a so e tional elevation of a throttle valveprovided with means for the admission of oil thereto tor lulu-hintingpurposes. .l is. 4L. is a plan thereof and, Fig. 5 is an elevation ofthe casing shown in Fig. 1. Figs. (5 and are elevations of two slightlymodified forms of throttle valves. Fin. 8 a section of part of anothermodification and his}; is an cleration illustrating a modified inletport.

I ills shown in Figs. 1 and 2 the valve consists of a cylindrical body awith conical ends F; b, or as shown in fig. (3 the ends 0 0 may havehollow taper, or as shown in F 1g. 7 the ends (Z (Z may be roundedconvexedly. Preferably the valve is provided with a central stern orcylimlrical entensioi'i c of relatively small diamele" and. length ateach end. By making;- the valve ends idcntical it liillows that when oneend becomes worn or damage l its position in the casing may be re and pactically the life of the valve as doubled. The said valve fits freelyin a hollow cylindrical casing f open at one end g and there providedwith an eX- ternally screw-threadcd ring screwing into the ca, ug and:t'orni'ing a valve seating 72. It will be noted that the upper inneredge of the ring: 72. makes a line contact with the conical end 5 whenthe latter seats itself upon the ring, this line contact being preferredto an annular surface contact such as would be produced by forming amiter face or bevel on the ring 71.. inlets c' are ada'g'ited. to beclosed by the cylindrical. portion (1. oi; the valve when the valve ison its seat it, a spring" 72 tend to lreep the valve on its seat 7t.this end oi. the valve casino; 7 is suitably provided with a hexagonshaped portion. Z and externally the casing: is turnished with a screwthread on which is adapted to secure the valve casing f in ascrew-threaded hole in the handle or frame of the percussive or othertool. If desired, the casing may be open at both ends, but the openingat the end remote from the valve seating 72. is provided with a plug nwhich, when removed permits of the insertion of a screw driver whichtakes into a transverse slot 0 in the stem of the valve so that thelatter may be ground on to its seat h. The plug it moreover serves as anabutment for the spring 7), preferably a helical sprin tending to keepthe valve onto its seat. The plug n may be solid, or as shown in Figs. 3and l, the plug 9 is perforated and provided with a seat for a ball orother valve 1 kept in place by the aforesaid helical spring 79 butdisplaceable by the spout of an oil can when it is desired to introducelubricant. The valve itself is preferably provided with an axial hole .9through which oil passes to V the motor served by the valve.

As shown in Fig. 1 the inlets i are drilled at an angle so as topointmore or less in the direction of the valve seat h, whereas in Fig.3 they are at right angles to the axis of the casing f, but in eithercase they are made at different distances from the valve seat. The valveis pressed away from the seating by means for example of a push pin orplunger 25 (Figs. 1 and 3) which is operated by a suitable lever 02. Asthe valve is raised one inlet port 6 after another is uncovered untilthey are all fully open. Instead of the axial hole of the valveextending from end to end, it may, shown in Fig. 8, be closed at eachend: by plugs 24 and provided with lateral ports or openings 1) and w.The body portion of this valve is cylindrical in the middle and tapersthen very slightly toward the places where the miter valve ends begin soas to allow of the passage of the lubricant. In place of an inclinedseries of inlet holes 2', an inclined aperture or sloti may be used asshown in Fig. 9.

I claiin:

1. A throttle valve, comprising a cylindrical piston valve formed with atapered end portion and also with a passage communi- 5O eating betweenpoints situated at opposite ends of the cylindrical portion of saidvalve,

a cylindrical casing inclosing said piston valve with a sliding fit,said casing having a port formed in the wall thereof, an annular seatingin the interior of said casing, a spring seated within said casing andadapted to force said valve in the direction for maintaining saidtapered portion in contact with said seating in which position saidpiston valve covers said port, and means on said casing for permittingof the introduction of lubricant into the same substantially as setforth.

2. A throttle valve, comprising a cylindrical piston valve formed with atapered end portion and also with a passage communicating between pointssituated at opposite ends of the cylindrical portion of said valve,

a cylindrical casing inclosing said piston valve with a sliding fit,said casing having a port formed in the wall thereof. an annular seatingin the interior of said casing at one end thereof, a hollow plug closingthe opposite end of said casing, a spring compressed between said plugand said piston valve and constantly tending to hold the tapered portionof said valve in contact with said seating in which position said pistonvalve covers said port, and a self closing valve arranged in said hollowplug and adapted to normally close the passage through said plugsubstantially as set forth.

JOSEPH FRANCIS OVENDEN.

Vitnesses:

W. HORBEY, W. E. ROGERS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

